where \(\lambda _e\)  is the Coulomb logarithm relevant for electron collisions. Details for this collision operator can be found in [1]}. The numerical values as well as the derivation of \(\delta \)  were originally calculated in [2]} and then modified for QuaLiKiz's purposes. Because \(\nu \)  is a function non-trivial of \(\xi \) , we cannot simplify the functional using this collision operator using Fried and Conte integrals, and the integration over the energy must be done numerically. The inability to simplify the \(\xi \)  integration results in 2-dimensional integral. That aside, all other aspects of the trapped functional derivation remain intact.
